For an A.P. if t8 = 6, d = – 2, then what is the value of a ?

Question

For an A.P. if t8 = 6, d = – 2, then what is the value of a ?

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Alaia 1 month 2021-08-17T22:11:58+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-08-17T22:13:29+00:00

    Answer:

    a=20

    Step-by-step explanation:

    d=-2

    t₈=6

    a=?

    t₈=a+7d      [a-(n-1)d]

    6=a+7×(-2)

    6=a-14

    a=20

    0
    2021-08-17T22:13:48+00:00

    GIVEN :

    For an A.P. if t8 = 6

    d = – 2

    TO FIND:

    value of a

    FORMULA USED:

    • Tn = a + (n-1)d

    SOLUTION :

    Tn = a + (n-1)d

    T8 = a+(n-1)d

    6 = a+(81)(2)

    6 = a+ (7 × 2)

    6 = a+ (14)

    6+14 = a

    20 = a

    ANSWER => a = 20

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